src/gallium/auxiliary/draw/draw_vs.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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  26  **************************************************************************/
  27
  28 /* Authors:  Keith Whitwell <keith@tungstengraphics.com>
  29  */
  30
  31 #ifndef DRAW_VS_H
  32 #define DRAW_VS_H
  33
  34 #include "draw_context.h"
  35 #include "draw_private.h"
  36
  37
  38 struct draw_context;
  39 struct pipe_shader_state;
  40
  41 /**
  42  * Private version of the compiled vertex_shader
  43  */
  44 struct draw_vertex_shader {
  45
  46    /* This member will disappear shortly:
  47     */
  48    struct pipe_shader_state   state;
  49
  50    struct tgsi_shader_info info;
  51
  52    void (*prepare)( struct draw_vertex_shader *shader,
  53                     struct draw_context *draw );
  54
  55    /* Run the shader - this interface will get cleaned up in the
  56     * future:
  57     */
  58    void (*run_linear)( struct draw_vertex_shader *shader,
  59                        const float (*input)[4],
  60                        float (*output)[4],
  61                        const float (*constants)[4],
  62                        unsigned count,
  63                        unsigned input_stride,
  64                        unsigned output_stride );
  65
  66
  67    void (*delete)( struct draw_vertex_shader * );
  68 };
  69
  70
  71 struct draw_vertex_shader *
  72 draw_create_vs_exec(struct draw_context *draw,
  73                     const struct pipe_shader_state *templ);
  74
  75 struct draw_vertex_shader *
  76 draw_create_vs_sse(struct draw_context *draw,
  77                    const struct pipe_shader_state *templ);
  78
  79 struct draw_vertex_shader *
  80 draw_create_vs_llvm(struct draw_context *draw,
  81                     const struct pipe_shader_state *templ);
  82
  83
  84 /* Should be part of the generated shader:
  85  */
  86 static INLINE unsigned
  87 compute_clipmask(const float *clip, /*const*/ float plane[][4], unsigned nr)
  88 {
  89    unsigned mask = 0x0;
  90    unsigned i;
  91
  92    /* Do the hardwired planes first:
  93     */
  94    if (-clip[0] + clip[3] < 0) mask |= CLIP_RIGHT_BIT;
  95    if ( clip[0] + clip[3] < 0) mask |= CLIP_LEFT_BIT;
  96    if (-clip[1] + clip[3] < 0) mask |= CLIP_TOP_BIT;
  97    if ( clip[1] + clip[3] < 0) mask |= CLIP_BOTTOM_BIT;
  98    if (-clip[2] + clip[3] < 0) mask |= CLIP_FAR_BIT;
  99    if ( clip[2] + clip[3] < 0) mask |= CLIP_NEAR_BIT;
 100
 101    /* Followed by any remaining ones:
 102     */
 103    for (i = 6; i < nr; i++) {
 104       if (dot4(clip, plane[i]) < 0)
 105          mask |= (1<<i);
 106    }
 107
 108    return mask;
 109 }
 110
 111 #define MAX_TGSI_VERTICES 4
 112
 113
 114 #endif